Combined spring and lever scale.



PATENTED NOV. 21, 1905;

c. H. HAPGOOD.

COMBINED SPRING AND LEVER SCALE. I

' APPLICATION FILED APR.8, 1903.

3 SHEETSSHEET 1.

- I'I I I I I I IIIIIIII H III lNVENTOf? 77% I WITNESSES:

A TTOR/VE Y ITO-804,947. PATENTED NOV. 21, 1905.

G. HAPGOOD.

COMBINED SPRING AND LEVER SCALE. APPLICATION FILED APR. a, 1903.

3 SHEETS-SHEET 2.

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APPLICATION FILED APR. 8, 1903.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

CLARENCE H. H-APGOOD, OF DAYTON, OHIO, ASSIGNOR TO THE COMPUT- SCALE COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO.

COMBINED SPRING AND LEVER SCALE.

To all whom it may concern.-

Be it knownthat I, CLARENCE H. HAP- I GOOD, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in a Combined Spring and Lever Scale; and I do declare the following to be a full, clear,'and exact description of the invention, such as willcenable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to improvements in combination spring and' lever scales.

Theobject of the invention is to provide meansby which the changes in the tension of the spring or springs of the scale due to the variations in the temperature of the surrounding atmosphereare compensated for by a corresponding change in the levera e of the weighing-lever through the action a thermostat. I

Preceding a detail description of the invention'reference is, made to the accompanying drawings, of which+ Figure 1 .is a side elevation of a combined spring and lever scale having my improvements applied. Fig. 2 is an enlarged top viewof a portion of the weighing-lever with the thermostatic mechanism applied. Fig. 3 is a side elevation of the mechanism shown in Fig. 2. Fig. 4 is a sectional view on the line as x of Fig. 1. Fig. 5 is a detached view of the multiplyin lever. Figs. 6 and 7 are detached views 0 the levers which connect the multiplying-lever with the pivot-carrier.

' Fig. 8 is a side and endelevation of the pivotcarrier. Fig. 9 is a partial sectional side elevation of a scale, showing the use of two I; springs which are attached above the weigh- Specification of Letters Patent.

Application filed April 8, 1903. Serial No. 151.579-

Patented Nora-21, 1 905.

designates a weighing-lever, which is fulcrumed on frame 5 by means of knife-edge pivot 3 and has on one end thereof a knifeedge pivot 2, which supports a platform or a weighing-plate 10. The other end of said Weighing-lever has a movable knife-edge pivot 4, which is rigidly mounted on a carrier 7, movable on antifriction-bearings 26 in a suitable opening 6 in the end of said lever, said carrier being operatively maintained in such position by guide-lugs 9, which project on each side of the lever. By means of this changeable pivot 4 the leverage of the weighsisting of the-usual dial 27 and pointer 28, the.

latter being fixed to the arbor 23 of said pinion.

designates a thermostat, preferably of ahorseshoe shape and constructed of metals of different expanding and contracting natures--for example, brass and steel. This thermostat device is attached at one end to the weighing-lever 1 by a pivot 19, and the opposite end of said thermostat is free to move under the contracting and expanding influences of the temperature of the surrouning atmosphere. The said free end of said thermostat is pivotally connected to a multiplying-lever 15. Therefore the energy transmitted to said thermostat from the variations in the atmospheric temperature will be likewise correspondingly transmitted to the multiplying-lever 15, according to the direction of the movement of said thermostat. The multiplying-lever 15 is fulcrumed at one end to a pivot 16 on an upright arm 25, which is ri idly supported on the weighing-lever The carrier 7, upon which the pivot 4 is rigidly mounted, is connected with said multiplying-lever 15, so that it may "receive the movements transmitted to .said multiplyinglever by the thermostat. The means for connecting said carrier consists of adjustable connecting-links 11 and 13, oneof which is pivoted at '12 to saidcarrier and the other of which is pivoted to the multiplying-lever at 17, said pivot passing through an oblong slot 17 in said multiplying-lever. The connected to the weighing-lever 1, as hereinbe-- fore stated, the said multiplying-lever should be in aposition approximately at a right angle to the weighing-lever. It is therefore obvious that the position of the said multiply-- ini-lever should not be interfered with in any 'su sequentadjustment of the pivot 4 that might be found necessary to bring said pivot 'in a properposition relatively to -,the lower end of the spring or springs 24. It is possible to thus avoid interfering with the posi- 'tion of the thermostat and the multiplyinglever by means of the connecting-links 11 and. 13, which, as hereinbefore stated, are ad justable lengthwise by means of the slots 14.

It will be seen that thedistance between the I pivots 16 and 18 is of adefinite nature or is 0 always the same regardless of the extent of themovement imparted to the thermostat,

\ and thence to theinultiplying-lever 15; but

the distance between :the pivot 16 and the pivot 17 a is not hf a' permanent nature/but I 3 5 may be changed in order to. increase or de' crease the extent of the movementimparted to the pivot-carrier 7 from the thermostat through the multiplying-lever 15. As shown in Fig. 3,-thedistance between 40 the pivots 16 and 17 a is less thanthe distance between the pivots 1 6and 18. Itv therefore fol lows .that the movement transmitted to the pivot-carrier 7 will notijhevaseat as the movement imparted to the multiplying-lever by the thermostat through -a;changein the temperature of the surrounding atmosphere.

v As anexample, itmay be statedthat in a change of temperature-say: in 50." 'the thermostat will not impart tofthe pivgSt-car 5c rier 7 suflicient movement to compensatefor the variation in the tensionof'thespring-or I springs due to that de ree ofjtemperaturei. Therefore the distance it compensate for the change'in the tension of thesprings, and thus enable the indicating pivot '16 and the ivot 17 isdetermi'ned; but the connection 0 lever 13 with said pivot 17 is not of a rigid character. The pivots '16-,

6'5 18, and 17 are all sufficiently loose to per-U- sai om the pivot 16-176 the ivot 17 is made greater than that shown l in ig. 3 inorder to properly change the lev- U erage of the weighing-lever, and; thereby Witnesses:

init of the movement of the arts with the least ossible friction; but ohviously there should be no lost motion permitted between the arts, for the reason that the movements of t e thermostat and the intervening levers must be positively transmitted'to the pivotcarrier7.

As hereinbefore stated, my improvements are applicable to an of the various forms of combined spring an lever scales.

In Fig. 9 the fulcrum-pivot 3, it will be observed,'is on one end of the weighing-lever '1, and the loadpivot 2 is between the fulcrum-pivot and the' movable power-pivot 4, The springs 24 have fixed points of attachment above the weighing-lever instead of below, as in Fig. 1, and are connected to the. movable powerpivot 4 through cross-bar 29 and link 30.

Having described my invention, I clairn- 1. In a combined spring and lever scale, a lever having pivots, one of which is movable len thwise of said lever, a carrier upon which d'n ovable pivot is mounted, a thermostat, a multiplying lever'to which said ther.

mostat is connected, adju'stableconnections o between said multiplying-leverahd the carrier whereb'ya proper adjustment of the movable pivot-relative to the lower extremity of the spring is obtained.-

2. In a combinedspringwand lever scale, a 5

lever having pivots one of which is movable lengthwise of the lever, a thermostat for moving saidpivot and adjustable connections between the thermostatand pivot whereby the pivot may be set to correct initial position; I00

3. In-a combinedspring' and leverscale, a weighing-lever having a longitu'dinally-movable pivot, thermostatic Idevicesadapted to impart movement to said pivot to compensate for the effect of variations in temperar05- ture on the counterbalanci mechani'smand means formanually adjusting said pivot to correctinitial osition.

4. Ina com ined spring and lever scale, a.

weighing-lever having a longitudinally-mov- I 1,0 I

able pivot, a lever, adjustable connections between said last-mentioned lever and longitudinally-movable dpivot and a thermostat connected with sai last ment'ione'd lever to impart movement to the pivot. 4

5., Ina combined spring and lever scale, a. weighing-lever having .a lon 'tudinally-mov- -able ivot,-.a 'thermostat,-a ever with which the t ermostatis connected and a connection between said last-mentioned lever and 120. pivot' adjustable toward and from the axis of the' lever whereby: the effective throw of the lever moving the pivot may be. varied. In testimony whereof I afiix my signature in presence of two witnesses.

' CLARENCE H. HAPGOODMI I Runawa Kannrus. 

